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Your pressures will need to change once you hook a trailer, unless there is an automatic leveling system as well. Ideal pressure will vary on countless things per vehicle and conditions. The biggest thing to shoot for is a level ride when you are driving, with or without a trailer.

One thing to remember though is most systems require a minimum of 5-10 psi in the bags at all times.

Great feedback. Thank you. I put 50 in the back and it has held for our maiden voyage up through the mountains in New Hampshire. I must have found a good spot as I didn't notice any rock and roll through the windy rutted roads up here. I will adjust once I hook the trailer up. Thanks!

I have read,front air bags have an effect on front end allignment when not inflatted,inside tire wear.

Anything, airbags included, that will change your ride height will have an effect on your alignment. If your bags are the main source of lift, aka no springs in the front, you would need to get it aligned at your standard pressure.

You should only add pressure to keep the height the same if for some reason the front were to have added weight.